list01 = [1,2,3,4] 
list02 = [1,2,4]
""""
in 为真判断，有元素时返回True
"""
if 3 in list01:
    print("OK,True")
else:
    print("NO,False")

""""
not in 为真判断，有元素时返回True
"""
if 3 not in list02:
    print("OK2,True2")
else:
    print("NO2,False2")